Conditional statement for value of array

I am trying to create a conditional statement for the value of an array.

We are assigning a class randomly to an element using PHP every time the page loads. We are using the following code:

<?php $words = array('pizza','barbers','gyms'); echo $words[rand(0, count($words)-1)]; ?>

The above works fine, except we need to check the value of the random class that has been outputted show specific content for that value.

So far I have:

 <?php if (in_array("pizza", $words)) { ?>
 This should show for pizza
 <?php } ?>

But this isnt working, any help would be greatly appreciated!

Thanks